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To ALL wHoMuIT MAY CONCERN:

Be it known that I, A. N. GARLAND, of West Charleston, in the county ofOrleans, and State of Vermont, have invented a new and improvedMillstone Dress and I do hereby declare the following to be a full,clear, Aand exact description of the same, reference being-had to the'accompanying drawings, forming part of this specification, and inAwhichn Figure'l is a view of the face of one of the stones.

Figures 2 and 4 are vertical sections through the centre of the-stonesa's-they are in'position for working.

Figure 3 is a longitudinal section ofthe pattern used in bosoming thestone. i

i Similar letters of reference indicate corresponding parts fin theseveral figures.

l In this invention thefurrows are made wide, shallow, and smooth, oneedge being cut clean and sharp. Between the furrows the surface near thecentre of the stone is smooth, and' at other 'parts of the stone 'is cutlike the face of a file. A- new method of bosoming the stone is alsoused.

In order that others skilled in the artto which my invention appertainsmay he enabled to make and use the same, 1 will proceed to describe itin detail.

In the drawings, A represents the upper and B the lower stone. A'.lhechannels C C are curved, radiating from the centre, and arranged in `theturbine or vertical manner, having their bottom inclined from the side ec to the deeperside c c', where they terminate at the bottom ofaperpendicular wall, the upper'edge of which is carefully dressed andsmoothed into a sharp, clear cutting-edge. At the inner end of thelchannels C C thel incline commences at the top of the perpendicularwall 0'., terminating at the bottom of the next one to the right ofV it,thus occupying the whole space between the walls cf c. Atthe outer endofv thel channels their inclined surface does not occupy the wholedistance from e` toe', but only the distance from c to c' on its right,or about one-half'the distance from c to c. The surfaccof stone betweenthe point e and the point c on its right hand,and extending from theouter edge of. the stone to theA line D, is fiat, and cut in iinethreads, like the face of a tile, the threads running in the samedirection as the channels C C. Inside of the line D the surface of stonebetween the channels is perfectly smooth. The surface enclosed by thecircular line D is designed to-be in proportion to the whole surface ofthe stone nearly as shown in the drawing, in which the diameter of thecircle D is about two-fths the diameter of the whole stone. The depth ofthe channels CC is onc-eigbth of an inch in the bed-stone, and'three-'sixteenths of an inch in the upper stone. The inclined bottomsurface of the channels 'is'nade perfectly smooth. There is nodifference between the channels in the upper and those in the netherstone, except in their depth. To bosom the upper stone, -I make a.pattern, of which a longitudinal section is shown in g. 3, the length ofwhich, from E Ato F, is to be one-half theradius of the storie, and thedepth at Gr, the deepest part, about one-sixteenth of an inch, runningto nothing at F. is the rod on which it turns, standing vertically inthe centre of the'eye. I paint the under side ofthe pattern from E to F,then, while the paint is not dry, apply it to thestone and rotate ittill the paint, where it touches,` adheres tothe surface of the stone.'I then remove the pattern and pick off the painted surface of thestone, continuing the operation till the bosom is formed as desired.This part of the stone is. then to be smoothed as perfectly as possible,as is also the corresponding surface of the bed-stone. l

The old form of channel is cut so as to occupy about one-third of thesurface from-c to c',- and is onei quarter of an inch or more in depth.Such a narrow and deep furrow causes a great.V amount' of friction, andthe meal'leaves the stone heated, especially in grinding fast. Theperpendicular walls c e', with'smooth, sharp, upper edges, prevent thebran from being chopped up, and render the separation of the bran fromthe flour more perfect. Millers are very liable to break off smallparticles from the edge of the shouldenor wall c' c', leaving it roughand irregular, imagining that such irregularities can do no harm. Theeffect, however, is `that the crushed wheat passes over this shoulder,and the bran adhering to it, catches on the sharp points along the roughedge', and is cut and ground'ii'ne,'so that it cannotbe Separated fromthe our. In my invention these defects in the working of tbc millstonesare completely obviated. The ilour runs freely in the smooth,well-defined channels, the air is admitted without obstruction in thedeeper channels of the upper stone, the sharp upper Aedges of thewalls cc refuse to tear and grind the bran and the smooth inner surface ofstone,\j.f f

inside of the line D, cracks and crushes instead of cutting the kernel,while the threaded file-surface on the outer part of the stonethoroughly pulverizes the flour.

Having thus described my invention, what'I claim as new, and desire tosecure by Letters Patent, is-

The mills'tone dress above described, oonsisting of tho smooth-surfaceinside,'and the le surface out side ofthe line D, together with thesmooth shallow channels in the bed-stone, and deeper ones in the runner,the channels in both stones being constructed in the curved form abovedescribed, widening towards the rim of the stones,`and haring one smoothinclined surface and one perpendicular wall, e', the upper edge of thewall being sharp and smooth, and all' the parts heingconstrueted andarranged substantially in the manner and for the purposes specified.

A. N. GARLAND. Witnesses vCEYLON COLE, JAMES LEWIS.

